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vacuum modulation with forced induction

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Old Jul 27, 2005 | 10:52 AM
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Default vacuum modulation with forced induction

I'm looking at upgrading my 4L60e and at the same time going to vacuum modulation. Anyone know the impacts of vacuum modulation if one were to add a s/c in the future? I know there is a relation between the two and that a bypass is required if you have both Vacuum Modulation and a Supercharger (FI), but I don't know how that works.

If I were planning to add a blower in the future, would I install the bypass now, or then?
Would it be unwise to have the bypass installed BEFORE you had a blower installed (i.e. you are planning to install a blower in the next year or so)?
Is it something that can easily be added two years down the road?

If anyone knows much about this, I'd apprecaite some clarification.
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Old Jul 27, 2005 | 11:59 AM
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you gotta have a bypass valve...add it when you add your charger/turbo...till then just run without it...reallly easy to install...hope this helps ...Dave
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Old Jul 27, 2005 | 07:03 PM
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Thanks Rock On. Makes sense.

What does it really do though?
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Old Jul 27, 2005 | 07:45 PM
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Mine has a check valve in the vacuum line to prevent boost from damaging the vacuum modulator.
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Old Jul 27, 2005 | 10:30 PM
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Where can you get this check valve at? I will be needing one soon i hope.
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Old Jul 27, 2005 | 10:39 PM
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Transgo has a check valve kit that you can add to their vacuum modulated shift kit.Chuck at FLP adds it to his transmissions that will be used for boosted applications.
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Old Jul 27, 2005 | 11:19 PM
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Thx for the explanations. Clears that up for me.
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